Fluffy, for the Grand Slam events, there are 128 players in the singles. Those include 8 wildcards and 12 qualifiers. That leaves 108 players who go in by virtue of their ranking. So it's players outside the top 108 who would go throught the qualifiers. The figure of 108 doesn't take into account players who have a protected ranking or any who are unable to compete due to illness, etc.
Heather Watson and Katie Swan have won their first qualifying round matches this morning.